760
FNUS76 KSEW 212127
FWSSEW

Spot Forecast for Backbone fire...IIMT-AUS/NZ IMT #3
National Weather Service Seattle WA
227 PM PDT Fri Aug 21 2026

Forecast is based on forecast start time of 0600 PDT on August 22.
If conditions become unrepresentative, contact the National Weather
Service.

Please contact our office at (206) 526-6095, if you have questions
or concerns with this forecast.

...RED FLAG WARNING IN EFFECT FROM 1 AM TO 5 PM PDT SATURDAY...

.DISCUSSION...An upper-low offshore will track into the region
by early Saturday morning with widespread showers and a chance
(10-15%) of thunder across the incident area. The threat should
largely end on Sunday evening as conditions trend drier. Low-level
onshore flow looks to remain throughout the period. Wetting rain
appears unfavorable.

.SATURDAY...

Sky/weather.........Cloudy (90-100 percent) then becoming mostly
                    sunny (30-40 percent). Chance of rain in the
                    morning.
CWR.................0 percent.
Chance of lightning.10 to 15 percent.
Max temperature.....Around 77.
Min humidity........54 percent.
Wind (20 ft)........Southwest winds 5 to 10 mph.
Mixing height.......2800 ft AGL.
Transport winds.....Southwest around 10 mph.
Rainfall amount.....0.00 inches.
Ceiling (KFT).......5.0 increasing to 25 in the afternoon.
Visibility..........10.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy (65-75 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....Around 55.
Max humidity........96 percent.
Wind (20 ft)........Southwest winds 5 to 10 mph.
Mixing height.......900 ft AGL.
Transport winds.....Southwest around 10 mph.
Rainfall amount.....0.00 inches.
Ceiling (KFT).......25 lowering to 10 late overnight.
Visibility..........10 lowering to 1 to 4 in showers.

.SUNDAY...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    sunny (15-25 percent).
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....Around 74.
Min humidity........55 percent.
Wind (20 ft)........West winds 5 to 10 mph.
Mixing height.......3300 ft AGL.
Transport winds.....West around 10 mph.
Rainfall amount.....0.00 inches.
Ceiling (KFT).......5 to 10 rising to 25 in the afternoon.
Visibility..........1 to 4 in showers rising to 10 in the afternoon.

$$
Forecaster...McMillian
Requested by...Situation Unit Leader
Type of request...WILDFIRE
.TAG 2619416.12/SEW
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL Jordan_Jobson@firenet.gov